CN217238644U - Passive pipe network monitoring system based on Internet of things - Google Patents
Passive pipe network monitoring system based on Internet of things Download PDFInfo
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- CN217238644U CN217238644U CN202220907727.8U CN202220907727U CN217238644U CN 217238644 U CN217238644 U CN 217238644U CN 202220907727 U CN202220907727 U CN 202220907727U CN 217238644 U CN217238644 U CN 217238644U
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Abstract
The utility model relates to a passive pipe network monitoring system based on the Internet of things, which comprises a thermoelectric generation device, an electric energy processing device, an Internet of things monitoring device, a first installation base and a second installation base; the thermoelectric power generation device comprises a thermoelectric chip, a radiator, a radiating plate, a radiating fan and a loop heat pipe, wherein the thermoelectric chip and the radiating plate are arranged on a first mounting base, the bottom surface of the thermoelectric chip is attached to the first mounting base, the top surface of the thermoelectric chip is attached to the bottom surface of the radiating plate, the loop heat pipe is fixedly arranged on the top surface of the radiating plate, the radiator is fixedly arranged on the loop heat pipe through the radiator base, and the radiating fan is fixedly arranged on the side surface of the radiator; the electric energy processing device and the Internet of things monitoring device are installed on the second installation base, and the electric energy processing device is electrically connected with the thermoelectric chip, the Internet of things monitoring device and the cooling fan respectively. The utility model provides a monitoring system, under the outdoor condition of not having the power, still can incessant transmission process data.
Description
Technical Field
The utility model relates to a pipe network monitoring technology field especially relates to a passive pipe network monitoring system based on thing networking.
Background
The Internet of Things (Internet of Things, IoT for short) is used for collecting any object or process needing monitoring, connection and interaction in real time through various devices and technologies such as various information sensors, radio frequency identification technologies, global positioning systems, infrared sensors and laser scanners, collecting various required information such as sound, light, heat, electricity, mechanics, chemistry, biology and position of the object or process, realizing ubiquitous connection of the object and the person through various possible network accesses, and realizing intelligent sensing, identification and management of the object and the process.
With the gradual development of the internet of things technology, the internet of things technology is widely applied to a pipe network monitoring system. At present, for long-distance conveying pipe networks, such as regional cold supply pipe networks, heat supply pipe networks, oil supply pipe networks and the like, the medium characteristic parameters of the conveying process can be monitored in real time through an internet of things monitoring system. Although the monitoring system of the internet of things only needs small electric energy, the monitoring system can normally work under the condition that a power supply is connected, so that the monitoring point setting of a long-distance conveying pipe network is limited by the condition of the connection of an outdoor power supply. Some monitoring systems operate by using a traditional battery maintenance system, but the failure time of the battery under outdoor conditions is uncertain, so that the related data of the middle process of a pipe network cannot be monitored, manpower and material resources are needed to maintain and replace the battery, and the management difficulty is increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a passive pipe network monitoring system based on the internet of things, which comprises a thermoelectric generation device, an electric energy processing device, an internet of things monitoring device, a first mounting base and a second mounting base; wherein:
the first mounting base and the second mounting base are fixedly mounted on the cold/hot water pipeline;
the thermoelectric power generation device comprises a thermoelectric chip, a radiator, a radiating plate, a radiating fan and a loop heat pipe, wherein the thermoelectric chip and the radiating plate are arranged on a first mounting base, the bottom surface of the thermoelectric chip is attached to the first mounting base, the top surface of the thermoelectric chip is attached to the bottom surface of the radiating plate, the loop heat pipe is arranged on the radiating plate, the radiator is arranged on the loop heat pipe, the bottom end of the loop heat pipe is fixedly connected with the radiating plate, the top end of the loop heat pipe is fixedly connected with the radiator base, and the radiating fan is fixedly arranged on the side surface of the radiator;
the electric energy processing device is installed on the second installation base and is electrically connected with the thermoelectric chip, the Internet of things monitoring device and the cooling fan respectively.
Furthermore, a first through hole is formed in the side wall of the heat dissipation plate, a second through hole is formed in the side wall of the radiator base, the bottom end of the loop heat pipe penetrates through the first through hole to be fixedly connected with the heat dissipation plate, and the top end of the loop heat pipe penetrates through the second through hole to be fixedly connected with the radiator base.
Furthermore, the radiating fins of the radiator are extruded aluminum radiating fins.
Further, the first mounting base is made of a heat conductive material, and the second mounting base is made of a heat insulating material.
Further, the electric energy processing device comprises a voltage boosting module and an energy storage module, wherein the thermoelectric chip is electrically connected with the voltage boosting module, the voltage boosting module is electrically connected with the energy storage module, and the voltage boosting module is further electrically connected with the Internet of things monitoring device and the cooling fan.
Further, the voltage boosting module is a TLV61255 boosting chip.
Further, the energy storage module is a storage battery.
Further, thing networking monitoring devices includes always controls the module, middle transmission module and characteristic parameter collection module, and middle transmission module is connected with always controlling the module, and middle transmission module is connected with characteristic parameter collection module, and wherein, always controls the module and middle transmission module installs on the second installation base, and characteristic parameter collection module installs on cold/hot water pipeline's collection position.
Further, the total control module is an M5310A Internet of things module or a WIFI module, and the middle transmission module is an STM32 chip.
Further, the characteristic parameter acquisition module is one or more of a temperature sensor, a pressure sensor or a flow sensor.
The utility model provides a passive pipe network monitoring system based on thing networking has following beneficial effect at least:
(1) through set up thermoelectric generation device on cold/hot water pipeline, thermoelectric chip in the thermoelectric generation device is in certain difference in temperature range from top to bottom all the time, utilizes seebeck effect directly to turn into usable high-grade electric energy with low-grade used heat, supplies with thing networking monitoring devices and uses, has solved the problem that thing networking monitoring devices still can realize teletransmission pipe network characteristic parameter data under outdoor no power condition, reduces the management degree of difficulty.
(2) The bottom end of the loop heat pipe penetrates through the first through hole, the top end of the loop heat pipe penetrates through the second through hole, so that the bottom end of the loop heat pipe is in full contact with the heat dissipation plate, the radiator base at the top end of the loop heat pipe is in full contact, and the heat exchange effect is improved.
(3) The radiating fins of the radiator are extruded aluminum radiating fins. The radiator is also the radiator adopting extruded aluminum radiating fins, so that the effective radiating area can be ensured, and dust accumulation can be avoided.
Drawings
For a clearer explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a monitoring system according to an embodiment of the present invention;
fig. 2 is a block diagram of a monitoring system according to an embodiment of the present invention;
fig. 3 is an exploded view of a monitoring system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a heat sink according to an embodiment of the present invention;
fig. 5 is a schematic view of a heat dissipation plate according to an embodiment of the present invention;
fig. 6 is a block diagram of an internet of things monitoring apparatus according to an embodiment of the present invention;
fig. 7 is a circuit diagram of a monitoring system according to an embodiment of the present invention;
the system comprises a 1-temperature difference power generation device, a 2-electric energy processing device, a 3-Internet of things monitoring device, a 4-first installation base, a 5-second installation base, a 101-thermoelectric chip, a 102-heat dissipation plate, a 103-loop heat pipe, a 104-heat dissipation device, a 105-heat dissipation fan, a 1021-first through hole, a 1041-second through hole, an 1042-heat dissipation plate, a 201-voltage boosting module, a 202-energy storage module, a 301-master control module, a 302-intermediate transmission module, a 303-characteristic parameter acquisition module, a 3011-instruction receiving unit, a 3012-wireless communication unit, a 3013-information sending unit and a 3014-storage unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model discloses an in the embodiment, provide a passive pipe network monitoring system based on thing networking, as shown in fig. 1, fig. 2, fig. 3, the system includes thermoelectric generation device 1, electric energy processing apparatus 2, thing networking monitoring devices 3, first installation base 4 and second installation base 5.
Wherein: the first installation base 4 and the second installation base 5 are fixedly installed on a cold water pipeline or a hot water pipeline. Specifically, the first mounting base 4 is made of a heat conductive material, such as a metal material, the second mounting base 5 is made of a heat insulating material, the first mounting base 4 is fixed to a pipe without a heat insulating material, and is directly contacted with a wall surface of a chilled water or hot water pipe, and more specifically, as shown in fig. 1, the first mounting base 4 and the second mounting base 5 are fastened to the pipe by heat insulating bolts.
The thermoelectric power generation device 1 is installed on the first installation base 4, and the electric energy processing device 2 is installed on the second installation base 5.
The thermoelectric power generation device 1 includes a thermoelectric chip 101, a heat dissipation plate 102, a loop heat pipe 103, a heat sink 104, and a heat dissipation fan 105.
The thermoelectric chip 101 and the heat dissipation plate 102 are mounted on the first mounting base 4, wherein the bottom surface of the thermoelectric chip 101 is attached to the first mounting base 4, and the top surface of the thermoelectric chip 101 is attached to the bottom surface of the heat dissipation plate 102, specifically, the thermoelectric chip 101 is attached to the first mounting base 4 by coating a heat conductive adhesive on the bottom surface and the top surface is attached to the heat dissipation plate 102. More specifically, the number of the thermoelectric chips 101 is determined according to actual requirements, and when two or more thermoelectric chips are arranged, the two or more thermoelectric chips are electrically connected in an electrically parallel manner, so as to solve the problem that the working current of the monitoring device cannot be reached due to too small output current caused by electrical series connection or electrical energy boosting. Heat sink 102 may be made of high thermal conductivity material such as stainless steel, aluminum or copper.
The heat dissipation plate 102 is provided with a loop heat pipe 103, the loop heat pipe 103 is provided with a radiator 104, the bottom end of the loop heat pipe 103 is fixedly connected with the heat dissipation plate 102, and the top end of the loop heat pipe 103 is fixedly connected with a base of the radiator 104. The heat dissipation fan 105 is fixedly disposed on a side surface of the heat sink 104, and an air outlet of the heat dissipation fan is aligned with the heat sink. The length of the loop heat pipe insulation section (i.e., representing the distance between the heat dissipation plate and the heat sink) depends on the actual operating environment, so as to transfer heat to the open environment for sufficient heat dissipation. Specifically, as shown in fig. 1 and 3, the loop heat pipe may be multiple, so that heat can be well transferred.
The electric energy processing device 2 is installed on the second installation base 5, and the electric energy processing device 2 is electrically connected with the thermoelectric chip 101, the internet of things monitoring device 3 and the cooling fan 105 respectively. The thermoelectric chip 101 is electrically connected with the electric energy processing device 2 (specifically, connected with the electric energy processing device 2 through the positive and negative lead-out wires), so that the generated current is introduced into the electric energy processing device 2, and the electric energy processing device 2 provides electric energy for the internet of things monitoring device 3 or stores the electric energy.
The working principle of the monitoring system in this embodiment is explained below:
when chilled water flows through the cold/hot water pipeline, part of cold energy of the chilled water is conducted by the wall surface of the cold/hot water pipeline to form the outer wall of the low-temperature pipeline; the freezing water pipeline is tightly attached to the first mounting base 4, and low-temperature first mounting base 4 is formed through heat conduction; the first mounting base 4 and the thermoelectric chip 101 are bonded by using a heat-conducting adhesive with better heat transfer performance, so that the surface of the thermoelectric chip 101 bonded with the first mounting base 4 is a low-temperature cold end; meanwhile, the cooling plate 102 transfers the cooling capacity to the radiator 104 through the loop heat pipe 103, and carries out heat convection with the open ambient air to form a high-temperature hot end; the air outlet of the heat dissipation fan 105 faces the heat sink 104 to enhance the heat convection.
The thermoelectric chip 101 sandwiched between the first mounting base 4 and the heat dissipation plate 102 generates a certain temperature difference inside due to the introduction of the cold and hot ends, electric power is generated by the seebeck voltage, current flows into the electric energy processing device 2 through the positive and negative electrode outgoing lines, and the current outputs stable and available electric energy to the internet of things monitoring device 3 and the heat dissipation fan 105 after passing through the electric energy processing device 2.
When hot water flows in the cold/hot water pipeline, the same heat conduction mechanism as the above is adopted, and the surface of the thermoelectric chip 101 bonded with the first mounting base 4 is a high-temperature hot end; the heat radiation plate 102 is a low-temperature cold end, and the thermoelectric chip 4 generates a certain temperature difference inside due to the introduction of the cold end and the hot end, so that a Seebeck voltage is formed to generate electric power and provide stable and available current.
It should be understood that the cold and hot surfaces of the thermoelectric chip 101 can be selectively applied according to the cold and hot states of the pipeline, and the positive and negative polarities of the output current can be adjusted accordingly.
The passive pipe network monitoring system based on the internet of things in the embodiment has the advantages that the thermoelectric generation device is arranged on the cold/hot water pipeline, the upper surface and the lower surface of a thermoelectric chip in the thermoelectric generation device are always in a certain temperature difference range, low-grade waste heat is directly converted into usable high-grade electric energy by utilizing the Seebeck effect, the internet of things monitoring device is supplied for use, the problem that the internet of things monitoring device can still realize remote transmission of pipe network characteristic parameter data under the outdoor power-free condition is solved, and the management difficulty is reduced.
In another embodiment of the present invention, as shown in fig. 4 and 5, a first through hole 1021 is disposed on the sidewall of the heat dissipating plate 102, a second through hole 1041 is disposed on the sidewall of the base of the heat sink 104, the bottom end of the loop heat pipe 103 passes through the first through hole 1021 to be fixedly connected to the heat dissipating plate 102, and the top end of the loop heat pipe 103 passes through the second through hole 1041 to be fixedly connected to the base of the heat sink 104.
The bottom end of the loop heat pipe 103 penetrates through the first through hole 1021 and the top end of the loop heat pipe 103 penetrates through the second through hole 1041, so that the bottom end of the loop heat pipe is fully contacted with the heat dissipation plate, and the radiator base at the top end of the loop heat pipe is fully contacted, so that the heat exchange effect is improved.
It should be understood that, for a loop heat pipe, when the pipeline is a hot water pipeline, the bottom end of the loop heat pipe 103 is also the evaporation section of the loop heat pipe, and the top end of the loop heat pipe 103 is also the condensation section of the loop heat pipe (the evaporation section absorbs heat, and the condensation section dissipates heat, so that the temperature of the heat dissipation plate is reduced); when the pipeline is a cold water pipeline, the bottom end of the loop heat pipe 103 is also the loop heat pipe condensation section, and the top end of the loop heat pipe 103 is also the loop heat pipe evaporation section (the evaporation section absorbs heat, and the condensation section dissipates heat, so that the temperature of the heat dissipation plate is increased).
In another embodiment of the present invention, the first mounting base 4 and the second mounting base 5 can be configured as arc-shaped bases, and the degree of engagement between the arc-shaped bases and the pipeline is high, so that the heat transfer efficiency of the first mounting base 4 is higher.
In yet another embodiment of the present invention, as shown in fig. 4, the fins 1042 of the heat sink 104 are extruded aluminum fins. That is, the heat sink 104 is a heat sink using extruded aluminum fins, which can ensure an effective heat dissipation area and prevent dust accumulation.
In another embodiment of the present invention, as shown in fig. 2, the electric energy processing apparatus 2 includes a voltage boosting module 201 and an energy storage module 202, wherein the thermoelectric chip 101 is electrically connected to the voltage boosting module 201, the voltage boosting module 201 is electrically connected to the energy storage module 202, and the voltage boosting module 201 is further electrically connected to the internet of things monitoring apparatus 3 and the heat dissipation fan 105. The voltage boosting module 201 can boost the electric energy of the thermoelectric generation device 1 to supply the electric energy to the internet of things monitoring device 3 and the cooling fan 105 for use, and the surplus electric energy is supplied to the energy storage module 202 for storage. When the water temperature of the pipe network is abnormal, the temperature difference formed by the water temperature and the air temperature is not enough to ensure that the temperature difference power generation device 1 provides enough electric energy, the surplus electric energy of the energy storage module 202 continuously provides electric energy for the internet of things monitoring device 3 and the cooling fan 105, and the data monitoring and remote transmission of the internet of things monitoring device 3 are ensured, so that the success of remote transmission of the pipe network characteristic parameters under abnormal working conditions is ensured.
Specifically, the voltage boost module 201 is a TLV61255 boost chip. The energy storage module 202 is a battery. More specifically, the storage battery is a detachable portable storage battery, and when the surplus electric quantity stored in the storage battery reaches the maximum limit capacity, the storage battery can be detached and replaced with a new one to continuously store the electric energy generated by the thermoelectric chip 4.
In another embodiment of the present invention, as shown in fig. 6, the monitoring device 3 of internet of things includes a total control module 301, an intermediate transmission module 302, and a characteristic parameter collecting module 303, the intermediate transmission module 302 is connected to the total control module 301, the intermediate transmission module 302 is connected to the characteristic parameter collecting module 303, wherein the total control module 301 and the intermediate transmission module 302 are installed on the second installation base, and the characteristic parameter collecting module 303 is installed on the collecting position of the cold/hot water pipeline.
Specifically, as shown in fig. 7, the master control module 301 is an M5310A internet of things module or a WIFI module, the intermediate transmission module 302 is an STM32 chip, and the characteristic parameter acquisition module 303 is one or more of a temperature sensor, a pressure sensor, or a flow sensor. Of course, also can be according to actual data collection's needs, will the utility model provides a characteristic parameter acquisition module 303 sets up to other sensors, the utility model discloses do not limit to this.
Further, as shown in fig. 6, the total control module 301 includes an instruction receiving unit 3011, a wireless communication unit 3012, an information sending unit 3013, and a storage unit 3014, and the wireless communication unit 3012 is connected to the instruction receiving unit 3011, the information sending unit 3013, and the storage unit 3014 respectively.
The electric energy processing device 2 provides stable working electric energy for the internet of things monitoring device 3, and after the internet of things monitoring device 3 obtains the stable electric energy, the internet of things monitoring device can receive an input instruction through the instruction receiving unit 3011 to generate a monitoring signal and send the monitoring signal to the wireless communication unit 3012; the wireless communication unit 3012 sends a monitoring instruction to the intermediate transmission module 302, receives characteristic parameter information such as temperature, flow rate, and pressure and node information such as address and time sent by the intermediate transmission module 302, and transmits the characteristic parameter information and the node information to the storage unit 3014. The information sending unit 3013 receives characteristic parameter information such as temperature, flow rate, and pressure, and node information such as address and time from the wireless communication unit 3012, and remotely transmits the characteristic parameter information to the cloud platform.
Further, the intermediate transmission module 302 receives the monitoring instruction and sends a start signal to the characteristic parameter acquisition module 303 according to the monitoring instruction, and the characteristic parameter acquisition module 303 is configured to acquire characteristic parameter information of the pipe network, send the characteristic parameter and the point address information to the intermediate transmission module 302, and send the characteristic parameter and the point address information to the wireless communication unit 3012 through the intermediate transmission module 302. The characteristic parameter collecting module 303 may select a single characteristic parameter or a plurality of characteristic parameters such as temperature, flow rate, pressure, etc. for simultaneous collection according to the usage requirement.
The passive pipe network monitoring system based on the internet of things in the embodiment is characterized in that the thermoelectric power generation device is arranged on the cold/hot water pipeline, the upper surface and the lower surface of a thermoelectric chip in the thermoelectric power generation device are always in a certain temperature difference range, low-grade waste heat is directly converted into usable high-grade electric energy by utilizing the seebeck effect, the internet of things monitoring device is supplied for use, the problem that the internet of things monitoring device can still realize remote transmission of pipe network characteristic parameter data under the outdoor power-free condition is solved, and the management difficulty is reduced.
It will be appreciated by those skilled in the art that changes could be made to the details of the above-described embodiments without departing from the underlying principles thereof. The scope of the invention is, therefore, to be determined only by the following claims, in which all terms are to be interpreted in their broadest reasonable sense unless otherwise indicated.
Claims (10)
1. A passive pipe network monitoring system based on the Internet of things is characterized by comprising a thermoelectric generation device, an electric energy processing device, an Internet of things monitoring device, a first mounting base and a second mounting base; wherein:
the first mounting base and the second mounting base are fixedly mounted on the cold/hot water pipeline;
the thermoelectric power generation device comprises a thermoelectric chip, a radiator, a radiating plate, a radiating fan and a loop heat pipe, wherein the thermoelectric chip and the radiating plate are installed on the first installation base, the bottom surface of the thermoelectric chip is attached to the first installation base, the top surface of the thermoelectric chip is attached to the bottom surface of the radiating plate, the radiating plate is provided with the loop heat pipe, the loop heat pipe is provided with the radiator, the bottom end of the loop heat pipe is fixedly connected with the radiating plate, the top end of the loop heat pipe is fixedly connected with the radiator base, and the radiating fan is fixedly arranged on the side surface of the radiator;
the electric energy processing device is installed on the second installation base, and the electric energy processing device is respectively electrically connected with the thermoelectric chip, the Internet of things monitoring device and the cooling fan.
2. The passive pipe network monitoring system based on the internet of things of claim 1, wherein a first through hole is formed in a side wall of the heat dissipation plate, a second through hole is formed in a side wall of the heat dissipation base, the bottom end of the loop heat pipe penetrates through the first through hole to be fixedly connected with the heat dissipation plate, and the top end of the loop heat pipe penetrates through the second through hole to be fixedly connected with the heat dissipation base.
3. The passive pipe network monitoring system based on the internet of things of claim 1, wherein the fins of the heat sink are extruded aluminum fins.
4. The passive pipe network monitoring system based on the internet of things of claim 1, wherein the first mounting base is made of a thermally conductive material and the second mounting base is made of a thermally insulating material.
5. The passive pipe network monitoring system based on the internet of things of claim 1, wherein the electric energy processing device comprises a voltage boosting module and an energy storage module, wherein the thermoelectric chip is electrically connected with the voltage boosting module, the voltage boosting module is electrically connected with the energy storage module, and the voltage boosting module is further electrically connected with the internet of things monitoring device and a cooling fan.
6. The passive pipe network monitoring system based on the internet of things of claim 5, wherein the voltage boosting module is a TLV61255 boosting chip.
7. The passive pipe network monitoring system based on the internet of things of claim 5, wherein the energy storage module is a storage battery.
8. The passive pipe network monitoring system based on the internet of things as claimed in claim 1, wherein the monitoring device of the internet of things comprises a master control module, an intermediate transmission module and a characteristic parameter acquisition module, the intermediate transmission module is connected with the master control module, the intermediate transmission module is connected with the characteristic parameter acquisition module, the master control module and the intermediate transmission module are installed on the second installation base, and the characteristic parameter acquisition module is installed on an acquisition position of the cold/hot water pipeline.
9. The passive pipe network monitoring system based on the internet of things of claim 8, wherein the total control module is an M5310A internet of things module or a WIFI module, and the intermediate transmission module is an STM32 chip.
10. The passive pipe network monitoring system based on the internet of things of claim 8, wherein the characteristic parameter acquisition module is one or more of a temperature sensor, a pressure sensor or a flow sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220907727.8U CN217238644U (en) | 2022-04-19 | 2022-04-19 | Passive pipe network monitoring system based on Internet of things |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220907727.8U CN217238644U (en) | 2022-04-19 | 2022-04-19 | Passive pipe network monitoring system based on Internet of things |
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| CN217238644U true CN217238644U (en) | 2022-08-19 |
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| CN202220907727.8U Active CN217238644U (en) | 2022-04-19 | 2022-04-19 | Passive pipe network monitoring system based on Internet of things |
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Address after: 510006 Floor 9, information hub building, No. 1, Chengzhong 6th Road, Guangzhou University, Xiaoguwei, Panyu District, Guangzhou City, Guangdong Province (office use only) Patentee after: Guangzhou Urban Investment Comprehensive Energy Investment Management Co.,Ltd. Address before: 510006 Floor 9, information hub building, No. 1, Chengzhong 6th Road, Guangzhou University, Xiaoguwei, Panyu District, Guangzhou City, Guangdong Province (office use only) Patentee before: Guangzhou University Town Investment Management Co.,Ltd. |
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